This thick micron exhaust filter slides inside the small grey door along the side near the bottom of the vertical Victory upright body where the air is exhausted. It measures 4" x 3.25" x 0.25" and is white with one light green side. This filter is used on most Eureka Victory uprights which do not have "True HEPA" exhaust filters. Eureka now sells this filter as a Package of 2 Filters. For similar products see our list of current Eureka Vacuum Supplies.